AIX OpenSSL Advisory : openssl_advisory14.asc (Logjam)

High Nessus Plugin ID 84880

Synopsis

The remote AIX host has a version of OpenSSL installed that is affected by multiple vulnerabilities.

Description

The version of OpenSSL installed on the remote AIX host is affected by multiple vulnerabilities :

- An invalid free memory error exists due to improper validation of user-supplied input when a DTLS peer receives application data between ChangeCipherSpec and Finished messages. A remote attacker can exploit this to corrupt memory, resulting in a denial of service or the execution of arbitrary code. (CVE-2014-8176)

- A denial of service vulnerability exists when processing an ECParameters structure due to an infinite loop that occurs when a specified curve is over a malformed binary polynomial field. A remote attacker can exploit this to perform a denial of service against any system that processes public keys, certificate requests, or certificates. This includes TLS clients and TLS servers with client authentication enabled. (CVE-2015-1788)

- A denial of service vulnerability exists due to improper validation of the content and length of the ASN1_TIME string by the X509_cmp_time() function. A remote attacker can exploit this, via a malformed certificate and CRLs of various sizes, to cause a segmentation fault, resulting in a denial of service condition. TLS clients that verify CRLs are affected. TLS clients and servers with client authentication enabled may be affected if they use custom verification callbacks.
(CVE-2015-1789)

- A NULL pointer dereference flaw exists in the PKCS#7 parsing code due to incorrect handling of missing inner 'EncryptedContent'. This allows a remote attacker, via specially crafted ASN.1-encoded PKCS#7 blobs with missing content, to cause a denial of service condition or other potential unspecified impacts. (CVE-2015-1790)

- A double-free error exists due to a race condition that occurs when a NewSessionTicket is received by a multi-threaded client when attempting to reuse a previous ticket. (CVE-2015-1791)

- A denial of service vulnerability exists in the CMS code due to an infinite loop that occurs when verifying a signedData message. A remote attacker can exploit this to cause a denial of service condition. (CVE-2015-1792)

- A man-in-the-middle vulnerability, known as Logjam, exists due to a flaw in the SSL/TLS protocol. A remote attacker can exploit this flaw to downgrade connections using ephemeral Diffie-Hellman key exchange to 512-bit export-grade cryptography. (CVE-2015-4000)

Solution

A fix is available and can be downloaded from the AIX website.

See Also

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc

https://www-01.ibm.com/marketing/iwm/iwm/web/preLogin.do?source=aixbp

https://www.openssl.org/news/secadv/20150611.txt

Plugin Details

Severity: High

ID: 84880

File Name: aix_openssl_advisory14.nasl

Version: $Revision: 1.6 $

Type: local

Published: 2015/07/20

Modified: 2015/12/22

Dependencies: 12634

Risk Information

Risk Factor: High

CVSSv2

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/o:ibm:aix, cpe:/a:openssl:openssl

Required KB Items: Host/AIX/lslpp, Host/local_checks_enabled, Host/AIX/version

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/07/15

Vulnerability Publication Date: 2015/05/20

Reference Information

CVE: CVE-2014-8176, CVE-2015-1788, CVE-2015-1789, CVE-2015-1790, CVE-2015-1791, CVE-2015-1792, CVE-2015-4000

BID: 74733, 75154, 75156, 75157, 75158, 75159, 75161

OSVDB: 122331, 122875, 123172, 123173, 123174, 123175, 123176